Hi I'm a Sri Lankan citizen who held British resident.

Nuwan, the documents you'll need to provide are as follows:
1. A valid passport and a photocopy of the passport's info page;
2. A fully completed application form attached with your recent color bare-headed photo;
3. A letter from a travel agency;
4. An Invitation Letter from Chinese Tourist Bureau;
5. Travel itinerary;
6. A copy of financial support document